Clean up Github Actions

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  push: 
+    branches: [ main ]
+  pull_request:
+  workflow_call:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        version:
+          - otp: 26.0
+            elixir: 1.15
+            os: ubuntu-latest
+          - otp: 22.0
+            elixir: 1.12
+            # It's necessary to run on ubuntu 20.04 for OTP 20 - 23
+            # See https://github.com/erlef/setup-beam
+            os: ubuntu-20.04
+    runs-on: ${{ matrix.version.os }}
+    name: OTP ${{matrix.version.otp}} / Elixir ${{matrix.version.elixir}}
+    env:
+      MIX_ENV: test
+    steps:
+      - uses: actions/checkout@v3
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{matrix.version.otp}}
+          elixir-version: ${{matrix.version.elixir}}
+      - run: mix deps.get
+      - run: mix compile --warnings-as-errors
+      - run: mix test
+      - run: mix credo

.github/workflows/publish.yml

@@ -0,0 +1,25 @@
+name: Publish
+
+on:
+  release:
+    types:
+      - published
+
+jobs:
+  test:
+    uses: ./.github/workflows/ci.yml
+
+  publish:
+    needs: test
+    runs-on: ubuntu-latest
+    name: Publish release
+    env:
+      HEX_API_KEY: ${{secrets.HEX_API_KEY}}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: 26.0
+          elixir-version: 1.15
+      - run: mix deps.get
+      - run: mix hex.publish --yes